Transparency holder for lantern slide projectors



A. SIMMON Nov. 25, 1952 TRANSPARENCY HOLDER FOR LANTERN SLIDE PROJECTORS 2 SHEETS-SHEET 1 Filed May 16, 1951 INVENTOR. QLFEED SIMMON HIS HTTOPNEYS 1952 A. SIMMON 2,619,007

TRANSPARENCY HOLDER FOR LANTERN SLIDE PROJECTORS Filed May 16, 1951 2 SHEETS-SHEET 2 INVENTOR. QLFRED SIMMON 562. .l /r M H IS QTT'ORNEVS projector is in use.

Patented Nov. 25, 1952 TRANSPARENCY HOLDER FOR LANTERN SLIDE PROJECTORS Alfred Simmon, Jackson Heights, N. Y., assignor to Simmon Brothers, Inc., Long Island City, N. Y., a corporation of New York Application May 16, 1951, Serial No. 226,633

4 Claims.

This invention, relates to lantern slide projecthe transparencies between glass plates pro-' vided with a mask which is a time-consuming and=expensive operation.

"Another object of the invention is to provide a' projector with a transparency holder whichfacilitates the operation of the projector in thatu the'operator of the projector may view the transparency after it has been placed in the holder.

and before it has been moved to projecting position.

Other objects and advantages of the invention will be apparent to those skilled in the art from the 'following specification and the drawings in which:

Fig. 1 is a cross-sectional view in a vertical plane of a projector embodying the invention;--

Fig. 2 is a top plan view of the same projector;-

-Fig. 3 is a view of the transparency holder with the transparency mounted therein for proby knurled knobs 34 which serve also as handles jection in a horizontal position as opposed to a ventional design comprises a light source I0, aw"

triple condenser formed by lenses II, II" and I I', and a projecting lens I2 which is mounted in'a helical mount I3 for focusing in a conventional manner. A mirror I4 backs the light source and a base I5, which may be a casting, A hol low casing I5 extends from the lens mount I3 backwardly along and surrounding the optical serves to support the aforesaid elements.

axis of the projector to the station where the transparency to be projected is located when the A cover I6 houses the light source.

The transparency support is a rotatable member which is generally cone-shaped and which vided with two circular apertures 23 and 24 and the angle of its apex is substantially The transparency support is rotatably mounted on a pivotal mount 25 for rotation about the axis of a cone which is coincident with the pivotal mount 25 and which intersects the optical axis of the projector at a 45 angle.

The transparency holders lie substantially on the surface of this cone. They comprise disks 25 and 21 which overlie the apertures 23 and 24 and lie substantially in the surface of a cone having an axis coincidental with the pivotal member 25 and a surface which extends into the station for viewing the film where it is perpendicular to the optical axis of the projector.

Thus, the transparencies in the holders may be:

positioned across the optical axis for projection as shown in Fig. 1.

The disks 26 and 2! are mounted for rotation in their own planes and may be held in position through engagement in groove 28 of a bullet catch 30 or the like.

Each of the disks 26 and 21 has a rectangular to enable the operator to rotate the disks 3| and 32 so that they turn from a position, such as is shown in Fig. 2 where the transparency is positioned for projection on the screen in a vertical position, to a position such as is shown in Fig.

3 where the transparency is positioned for projection in a vertical plane on the screen.

Within the housing I5, in addition to the aperture which is adjacent the station for projection and on the optical axis, I provide a second aperture 40. This lies at the top of the housing I5 and is so positioned that one of thetransparency holders is positioned thereover and in register therewith when the other holder is in position to permit projection of its transparency. This transparency is illuminated by light reflected from the interior Walls of the hollow body I5 so that the operator of the projector may observe the transparency after he has placed it in the holder to make sure that it is properly positioned. He may then, while viewing the transparency, adjust its position as desired be tween the positions shown in Figs. 2 and 3. It takes very little light for this purpose and even the black paint which would normally be sup plied inside of casing I5 will provide sufiicient reflected light to judge the position and content of the transparency.

on the surface of this cone and thus movefrom the projecting position to a position substantially parallel to the optical axis of ,the projector and opposite aperture 40 so that the operator may ob-n;

- for "rotation about the axis of a cone having an serve the transparency before swinging it to p'osi- 9 tion. These holders are positioned onopposite sides of and symmetrical with respect to the open unobstructed center of the member 2|! and sym-- metrical with respect to-fthe axis of the cone.

described. However, vit is .not intended-by describing. merely the preferred form to be limited .to this particular form .of the invention. Other formsof the invention may be employed.

,lclaim: I

1. In a lantern slide projector having an optical axis and a station thereon fora transparency to-b'e projected a transparency support mounted forrotati'on about the axis of a-cone having an angle at'its apexof approximately 90 and a surface perpendicular to said optical axis at said station and its axis intercepting said optical axis, said support-having an unobstructed centralpor- .tionlandra pair of transparency holders disposed symmetrically with respect to the axis of said cone and .said central portion and .lyingsubstantially on the surface of said cone 'andpositioned .to support transparencies substantially on said surface and in position tointerceptsaid optical axis and a mount for-said support spaced from said optical axis, whereby transparencies in said holders may be swung through a path on the tioned from said first aperture a distance equalv td-zthe distance between :said holders to align with oneof said holders when the other of said holders is positioned at said station.

-- In a lantern slide projector having an'optical axis 'and a station-thereon for a transparency to beprojecteda transparency support mounted for -rotation about the axis of 'a cone having a surface perpendicular to said optical axis at said station .andits axis intercepting said optical axis at approximately 45", said support having an unobstructed central portion and a pair of trans-- parency holders disposed symmetrically with respect to the axis of said cone and said central portion-and lying substantially on the surfaceof said cone and positioned to support trans- .parencies substantially on -said surface and in position to intercept said optical axisand a mount for said support spaced from said optical axis, whereby transparencies in said holders may be swung through a path on the surface of said cone from a position spaced, from said opticalraxis to 4 said station to intercept said optical axis for projection, and a housing disposed about said optical aXis and about which said support may be rotated, said housing having a flrst aperture adjacent said station and in line with said optical axis and a second aperture spaced from said optical axis and-con theepathofsmovement of said :holders and positionedfrom said Ifirsts'aperture a distance equal to the distance between said z olders to align with one of said holders when ,he other of said holders is positioned at said station.

3. In a lantern slide projector having an optical axisand a station thereon for a transparency utot'be projecteda transparency support mounted anglevat its apex of approximately and a sur- "face' perpendicular to said optical axis at said station'and its axis intercepting said optical axis, said support having an unobstructed central portion and a pair of transparency holders disposed symmetrically with respect to the axis .of said cone and said central portionand.lyin substantially-on the surface of said cone and positioned to support'transparencies substantially on said surface and in position to intercept said optical axis and a mount for said support spaced from said optical axis, whereby transparencies in said holders may be swung through a vpath :on the surface of said cone from a position'spaced-from and substantially parallel to said optical axisto said station to intercept said optical axis for projection, and a housing disposed about said optical axis and, about which said support may be rotated, said housing having a first aperture adjacent said station and. in line with said optical axis and a second aperture spaced from and'sub stantially parallel to said optical axis and on-the path of movement of said holders "and positioned from said first aperture a distance equal tothe distance between said holders to align with'one of said holders when the'other of said holders is positioned at said station, each of said :holders having an aperture lying substantially on the surface of said cone and having a disc overlying said aperture and mounted for rotation in its own plane and having a central rectangular'ape'rture and retaining means for retaining a slide :over said rectangular aperture. whereby the position of :said transparency may be adjusted by rotation of said disc. r

4. In a lantern slide projector having an'optical axis and a station thereon fora transparency to be projected a transparency support'mounted for rotation about the axis of a cone .having a surface perpendicular tosaid optical axis at'said station and its axis intercepting said optical axisi at approximately 45, saidsupporthaving anilinobstructed-central portionan'd a pair of trans-- parency holders disposed symmetrically withrespect .to the axis of said cone and 'said central portion and lying substantially on the surface of said cone and positioned to support transparencies substantially on, said surface and, in position to intercept said optical axis and a mount for said supportspaced from said optical axis, whereby transparencies in said holdersmay be swung through a path on the-surface of said cone from a position spaced from .said optical axis to said station to intercept said optical-axis for projection, and a housing disposed about said optical axis and about which said support may be-rotated, said housing having afirstaperture adjacent said station and in line with said optical axis and a second aperture spacedfrom'said 6 optical axis and on the path of movement of said holders and positioned from said first aperture a REFERENCES C ED distance equal to the distance between Said. hold- The references are of re o d in the ers to align with one of said holders when the fil of this patent; other of said holders is positioned at said station, 5 each of said holders having an aperture lying UNITED STATES PATENTS substantially on the surface of said cone and haver a e Date ing a disc overlying said aperture and mounted 1,407,906 Wenderhold 1922 for rotation in its own plane and having a central 2,445,929 Sturgess July 27, 1948 rectangular aperture and retaining means for re- 1 2,552,225 S mm s et a1 May 1951 taining a slide over said rectangular aperture whereby the position of said transparency may FOREIGN PATENTS be adjusted by rotation of said disc. Number Country Date ALFRED SIMMON. 205,788 Great Britain July 17, 1924 

